354 96 A train approaching a railway platform with a speed

Last updated: 6/9/2023

354 96 A train approaching a railway platform with a speed of 20 m s starts blowing the whistle Speed of sound in air is 340 m s If the frequency of the emitted 99 sound from the whistle is 640 Hz the frequency of sound as heard by person standing on the platform is a 600 Hz c 680 Hz b 640 Hz d 720 Hz